Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2026 Toyota Sienna?

• Typical diagnostic fees at Nalley Toyota of Roswell are straightforward and competitive; we often cost less than independent shops while delivering factory-level service.
• Diagnostics generally range from a modest flat fee for code read and basic inspection to a higher charge if in-depth testing is required; we provide clear estimates before work begins.
• Choosing our dealership can deliver immediate savings through accurate diagnosis and genuine parts, and long-term savings by avoiding repeated or incorrect repairs.
• Any repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure proper warranty processing.

What does it mean when the check engine light comes on in a 2026 Toyota Sienna?

• A lit check engine light signals the vehicle’s onboard diagnostics has detected an issue — from minor emissions faults to engine performance problems.
• Common causes include loose gas caps, EVAP leaks, misfires, or catalytic converter concerns; severity varies by code and conditions.
• Prompt dealership diagnosis ensures accurate identification and prevents small issues from becoming costly failures, delivering both immediate and long-term savings.
• Repairs covered under warranty must be done at a certified dealership to maintain warranty protection and ensure repairs are performed by factory-trained technicians.

What is the first thing to check when the check engine light comes on?

• Start with simple checks: ensure the gas cap is secure and the fuel filler is properly closed, as an EVAP leak can trigger the light.
• If the light persists, bring the 2026 Toyota Sienna to Nalley Toyota of Roswell for an OBD-II scan; our factory-trained techs read and interpret codes precisely.
• Early dealership service reduces the chance of bigger repairs later and often costs less than independent alternatives when considering long-term outcomes.
• Remember that warranty-covered repairs must be completed at a certified dealership to preserve coverage and guarantee parts and workmanship standards.

How long does a check engine light service take?

• Simple diagnostics and basic resets can take 30–60 minutes, while more involved troubleshooting or repairs may require several hours or a scheduled service appointment.
• At Nalley Toyota of Roswell we prioritize efficiency: factory tools, dealer-level processes, and trained technicians shorten turnaround and improve accuracy.
• Fast, correct repairs translate to immediate savings in time and money, and long-term savings by preventing repeat visits for unresolved issues.
• If work is covered by warranty, having the repair done at our certified dealership ensures compliance and preserves warranty benefits.

What is the most common reason for check engine light on a 2026 Toyota Sienna?

• The most frequent triggers are emissions-related issues such as EVAP leaks, oxygen sensor faults, and occasional misfires that affect engine efficiency.
• These problems often reduce fuel economy and can damage components like the catalytic converter if left unaddressed.
• Service at Nalley Toyota of Roswell usually detects problems quickly and corrects them with genuine parts, often costing less overall than independent shops when considering quality and longevity.
• Warranty-covered failures must be repaired at a certified dealership to keep warranty protection valid and ensure factory-recommended repairs.